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the solution:
4
5
6
2
3
8
9
1
7
2
9
8
4
7
1
3
5
6
1
3
7
6
9
5
8
2
4
5
8
2
9
1
6
4
7
3
9
1
4
7
5
3
6
8
2
7
6
3
8
2
4
5
9
1
3
7
1
5
4
9
2
6
8
8
4
9
1
6
2
7
3
5
6
2
5
3
8
7
1
4
9